Telephone Operation

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Across
  1. 5. A characteristic related to the frequency of sound.
  2. 7. A place where telephone switching takes place.
  3. 8. A quality or complexity characteristic of sound.
  4. 9. A mechanical device that vibrates in response to sound waves.
  5. 11. The type of circuit used to maintain suitable sound levels.
  6. 12. Varying a DC voltage to produce an electrical voice waveform.
  7. 13. A device that converts one form of energy into another form of energy.
  8. 15. A type of transmitter that uses electromagnetic induction to produce an electrical voice waveform.
  9. 17. A cable used to connect to a floor distributor.
  10. 18. How you make a call.
Down
  1. 1. Volume of sound.
  2. 2. Crystal type transmitter.
  3. 3. Used to get the telephone users attention.
  4. 4. A de-coupling device used to isolate a DC current from the ringer.
  5. 6. Unit of frequency.
  6. 8. The part of a handset you talk into.
  7. 10. A telephone device.
  8. 14. The part of a handset you listen to.
  9. 15. Sound level unit.
  10. 16. The type of energy telephones convert electrical energy into.